Coles, F. R. Record of (I) the Excavation of Two Stone Circles in Kincardineshire: (1) in Garrol Wood, Durris; (2) in Glassel Wood, Banchory-Ternan; and (II) Report on Stone Circles in Aberdeenshire, With Measured Plans and Drawings; Obtained under the Gunning Fellows. PSAS 1905, 39, 190-218.